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Steam engine
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Patent number 4,259,841
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Issue date Apr 7, 1981
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Universal Research and Development Corp.
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John C. Thomas
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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System and process for anaerobic digestion
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Patent number 4,252,901
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Issue date Feb 24, 1981
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Universal Research and Development Corp.
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David J. Fischer
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C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...
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Stacked modules for anaerobic digestion
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Patent number 4,248,972
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Issue date Feb 3, 1981
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Universal Research and Development Corp.
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David J. Fischer
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE